The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 1994
Filed:
Jul. 29, 1992
Kiyofumi Chikuma, Saitama, JP;
Sota Okamoto, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
An optical pickup using a fiber type SHG, an optical information recording carrier and an information recording and reproducing apparatus. In the optical pickup, the primary ray which was removed in conventional arrangements is utilized thereby the same pickup can be used not only for an optical disk of a high density but also for an optical disk of a usual record density. To raise the recording density of the information recording carrier the laminated structure is utilized to record information. Two rays having different wavelengths are directed onto the record layer and onto the recordable layer of the optical disk, and the information recording and reproducing apparatus performs the reproducing of information as well as error detection and record/reproduction of information, so that a novel reproduction mode is realized.